.NET GZipStream压缩和解压缩 [英] .NET GZipStream compress and decompress
本文介绍了.NET GZipStream压缩和解压缩的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
下面的代码有什么问题。我总是得到FALSE,意味着压缩后,解压缩的数据不匹配原始值。
What is wrong with this code below. I always get FALSE, meaning after compression, decompressed data does not match original value.
public static bool Test()
{
string sample = "This is a compression test of microsoft .net gzip compression method and decompression methods";
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
byte[] data = encoding.GetBytes(sample);
bool result = false;
//Compress
MemoryStream cmpStream;
cmpStream = new MemoryStream();
GZipStream hgs = new GZipStream(cmpStream, CompressionMode.Compress);
hgs.Write(data, 0, data.Length);
byte[] cmpData = cmpStream.ToArray();
MemoryStream decomStream;
decomStream = new MemoryStream(cmpData);
hgs = new GZipStream(decomStream, CompressionMode.Decompress);
hgs.Read(data, 0, data.Length);
string sampleOut = System.BitConverter.ToString(data);
result = String.Equals(sample, sampleOut) ;
return result;
}
我真的很感激,如果你能指出我犯错误的地方。
I will really appreciate if you can point out where I am making a mistake.
推荐答案
请尝试以下代码:
public static bool Test()
{
string sample = "This is a compression test of microsoft .net gzip compression method and decompression methods";
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
byte[] data = encoding.GetBytes(sample);
bool result = false;
// Compress
MemoryStream cmpStream = new MemoryStream();
GZipStream hgs = new GZipStream(cmpStream, CompressionMode.Compress);
hgs.Write(data, 0, data.Length);
byte[] cmpData = cmpStream.ToArray();
MemoryStream decomStream = new MemoryStream(cmpData);
hgs = new GZipStream(decomStream, CompressionMode.Decompress);
hgs.Read(data, 0, data.Length);
string sampleOut = encoding.GetString(data);
result = String.Equals(sample, sampleOut);
return result;
}
问题是,你没有使用ASCIIEncoder获取字符串sampleData。
The problem what that you were not using the ASCIIEncoder to get the string back for sampleData.
编辑:这是一个清理版本的代码,以帮助关闭/处置:
Here's a cleaned up version of the code to help with Closing/Disposing:
public static bool Test()
{
string sample = "This is a compression test of microsoft .net gzip compression method and decompression methods";
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
byte[] data = encoding.GetBytes(sample);
// Compress.
GZipStream hgs;
byte[] cmpData;
using(MemoryStream cmpStream = new MemoryStream())
using(hgs = new GZipStream(cmpStream, CompressionMode.Compress))
{
hgs.Write(data, 0, data.Length);
hgs.Close()
// Do this AFTER the stream is closed which sounds counter intuitive
// but if you do it before the stream will not be flushed
// (even if you call flush which has a null implementation).
cmpData = cmpStream.ToArray();
}
using(MemoryStream decomStream = new MemoryStream(cmpData))
using(hgs = new GZipStream(decomStream, CompressionMode.Decompress))
{
hgs.Read(data, 0, data.Length);
}
string sampleOut = encoding.GetString(data);
bool result = String.Equals(sample, sampleOut);
return result;
}
这篇关于.NET GZipStream压缩和解压缩的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文